I stick to my fingernail on anything vintage, for safety's sake. Dry cloth for the residue.

I don't know what that chemical exposure from Goo Gone would do long-term.

I'm VERY conservative with my application of Goo Gone, and I use my fingernails as well first. Any kind of chemicals are a last resort for me. Even then, after application, I immediately wipe any Goo Gone off. Sure the chemicals and materials are exposed at that point, but the Goo Gone is mostly taking care of the sticker and residue more than any thing of the plastic. I've done this for years, and yet to see any kinds of negative results. Again, my key is that I only let the Goo Gone do it's job mainly on the labels, not as much on the plastic.